Commitments and Contingencies

General

As of March 31, 2019, we had commitments of approximately $1.2 billion, excluding our ground lease commitments, for contracts and executed leases directly related to our operating properties and development projects.

Ground Leases

The following table summarizes our properties that are held subject to long-term noncancellable ground lease obligations and the respective contractual expiration dates:



Property	Contractual Expiration Date ⁽¹⁾
601 108th Ave NE, Bellevue, WA	November 2093
701, 801 and 837 N. 34th Street, Seattle, WA ⁽²⁾	December 2041
1701 Page Mill Road and 3150 Porter Drive, Palo Alto, CA	December 2067
Kilroy Airport Center Phases I, II, and III, Long Beach, CA	July 2084

____________________


(1)	Reflects the contractual expiration date prior to the impact of any extension or purchase options held by the Company.


(2)	The Company has three 10-year and one 45-year extension options for this ground lease, which if exercised would extend the expiration date to December 2116. These extensions options are not assumed to be exercised in our calculation of the present value of the future minimum lease payments for this lease.

On January 1, 2019, we adopted Topic 842 and recognized ground lease liabilities on our consolidated balance sheets equal to the present value of the minimum lease payments required in accordance with each ground lease. We also recognized right of use ground lease assets equal to the ground lease liabilities adjusted for above and below market ground lease intangibles and deferred leasing costs. To determine the discount rates used to calculate the present value of the lease payments, we used a hypothetical curve derived from unsecured corporate borrowing rates over the lease terms. The weighted average discount rate for our ground leases was 5.15%. On January 1, 2019, we recognized right of use ground lease assets totaling $82.9 million and ground lease liabilities totaling $87.4 million. As of March 31, 2019, the weighted average remaining lease term of our ground leases is 52 years. For the three months ended March 31, 2019, variable lease costs totaling $0.7 million were recorded to ground leases expense on our consolidated statements of operations.

The minimum commitment under our ground leases as of March 31, 2019 (under Topic 842) for future periods is summarized as follows:



Year Ending	(in thousands)
Remaining 2019	$	3,865
2020	5,154
2021	5,154
2022	5,154
2023	5,154
2024	5,154
Thereafter	228,465
Total undiscounted cash flows^{(1)(2)(3)(4)(5)}	258,100
Present value discount	(170,853		)
Ground lease liabilities	$	87,247

________________________


(1)	Excludes contingent future rent payments based on gross income or adjusted gross income and reflects the minimum ground lease obligations before the impact of ground lease extension options.

(2)

One of our ground lease obligations is subject to a fair market value adjustment every five years; however, the lease includes ground rent subprotection and infrastructure rent credits which currently limit our annual rental obligations to $1.0 million. The contractual obligations for that ground lease included above assumes the lesser of $1.0 million or annual lease rental obligation in effect as of March 31, 2019.

(3)

One of our ground lease obligations includes a component which is based on the percentage of gross income that exceeds the minimum ground rent. The minimum rent is subject to increases every five years based on 50% of the average annual percentage rent for the previous five years. The contractual obligations for that lease included above assume the current annual ground lease obligation in effect at March 31, 2019 for the remainder of the lease term since we cannot predict future adjustments.

(4)

One of our ground lease obligations is subject to a fair market value adjustment every five years based on a combination of CPI adjustments and third-party appraisals limited to maximum increases annually. The contractual obligations for that lease included above assume the current annual ground lease obligation in effect at March 31, 2019 for the remainder of the lease term since we cannot predict future adjustments.

(5)

One of our ground lease obligations includes a component which is based on the percentage of adjusted gross income that exceeds the minimum ground rent. The minimum rent is subject to increases every ten years by an amount equal to 60% of the average annual percentage rent for the previous three years. The contractual obligations for this lease included above assume the current annual ground lease obligation in effect at March 31, 2019 for the remainder of the lease term since we cannot predict future adjustments.

The minimum commitment under our ground leases as of December 31, 2018 for future periods is summarized as follows:



Year Ending	(in thousands)
2019	$	5,154
2020	5,154
2021	5,154
2022	5,154
2023	5,154
Thereafter	233,619
Total^{(1)(2)(3)(4)(5)}	$	259,389

________________________


(1)	Excludes contingent future rent payments based on gross income or adjusted gross income and reflects the minimum ground lease obligations before the impact of ground lease extension options.

(2)

(3)

One of our ground lease obligations includes a component which is based on the percentage of gross income that exceeds the minimum ground rent. The minimum rent is subject to increases every five years based on 50% of the average annual percentage rent for the previous five years. The contractual obligations for that lease included above assume the current annual ground lease obligation in effect at December 31, 2018 for the remainder of the lease term since we cannot predict future adjustments.

(4)

One of our ground lease obligations is subject to a fair market value adjustment every five years based on a combination of CPI adjustments and third-party appraisals limited to maximum increases annually. The contractual obligations for that lease included above assume the current annual ground lease obligation in effect at December 31, 2018 for the remainder of the lease term since we cannot predict future adjustments.

(5)

One of our ground lease obligations includes a component which is based on the percentage of adjusted gross income that exceeds the minimum ground rent. The minimum rent is subject to increases every ten years by an amount equal to 60% of the average annual percentage rent for the previous three years. The contractual obligations for this lease included above assume the current annual ground lease obligation in effect at December 31, 2018 for the remainder of the lease term since we cannot predict future adjustments.

Environmental Matters

We follow the policy of monitoring all of our properties, including acquisition, development and existing stabilized portfolio properties, for the presence of hazardous or toxic substances. While there can be no assurance that a material environmental liability does not exist, we are not currently aware of any environmental liability with respect to our stabilized portfolio properties that would have a material adverse effect on our financial condition, results of operations and cash flow, or that we believe would require additional disclosure or the recording of a loss contingency.

As of March 31, 2019, we had accrued environmental remediation liabilities of approximately $74.4 million recorded on our consolidated balance sheets in connection with certain of our in-process and future development projects. The accrued environmental remediation liabilities represent the remaining costs we estimate we will incur prior to and during the development process at various development acquisition sites. These estimates, which we developed with the assistance of third party experts, consist primarily of the removal of contaminated soil, performing environmental closure activities, constructing remedial systems and other related costs since we are required to dispose of any existing contaminated soil and sometimes perform other environmental closure or remedial activities when we develop new buildings at these sites.

We record estimated environmental remediation obligations for acquired properties at the acquisition date when we are aware of such costs and when such costs are probable of being incurred and can be reasonably estimated. Estimated costs related to development environmental remediation liabilities are recorded as an increase to the cost of the development project. Actual costs are recorded as a decrease to the liability when incurred. These accruals are adjusted as an increase or decrease to the development project costs and as an increase or decrease to the accrued environmental remediation liability if we obtain further information or circumstances change. The environmental remediation obligations recorded at March 31, 2019 were not discounted to their present values since the amount and timing of cash payments are not fixed. It is possible that we could incur additional environmental remediation costs in connection with these development projects. However, potential additional environmental costs for these development projects cannot be reasonably estimated at this time and certain changes in estimates could occur as the site conditions, final project timing, design elements, actual soil conditions and other aspects of the projects, which may depend upon municipal and other approvals beyond the control of the Company, are determined.

Other than the accrued environmental liabilities discussed above, we are not aware of any unasserted claims and assessments with respect to an environmental liability that we believe would require additional disclosure or the recording of an additional loss contingency.